Calorimetry

The objective is to measure
isothermal
?Hrx T1 Reactants (T1) = Products (T1)
()
constant p
• Constant pressure (for solutions)
CALORIMETER
reaction thermometer Adiabatic Constant p
adiabatic
I) ?HI React. (T1) + Cal. (T1) = Prod. (T2) + Cal. (T2)
constant p
II) ?HII Prod. (T2) + Cal. (T2) = Prod. (T1) + Cal. (T1)
constant p
?Hrx (T1 ) React. (T1) + Cal. (T1) = Prod. (T1) + Cal. (T1)
constant p
?Hrx (T1 )=?HI +?HII
(I)
Purpose is to measure (T2 -T1)
Adiabatic, const. p ? qp =0 ??HI =0
(II)
Purpose is to measure heat qp needed to take prod. + cal. from T2 back to T1.
qp =?TT12Cp (Prod . +Cal .)dT =?HII
??H ()=?T2C (Prod . +Cal . dT ?? T2C caldT =? cal
rx T1The objective is to measure
isothermal
?Hrx T1 Reactants (T1) = Products (T1)
()
constant p
• Constant pressure (for solutions)
CALORIMETER
reaction thermometer Adiabatic Constant p
adiabatic
I) ?HI React. (T1) + Cal. (T1) = Prod. (T2) + Cal. (T2)
constant p
II) ?HII Prod. (T2) + Cal. (T2) = Prod. (T1) + Cal. (T1)
constant p
?Hrx (T1 ) React. (T1) + Cal. (T1) = Prod. (T1) + Cal. (T1)
constant p
?Hrx (T1 )=?HI +?HII
(I)
Purpose is to measure (T2 -T1)
Adiabatic, const. p ? qp =0 ??HI =0
(II)
Purpose is to measure heat qp needed to take prod. + cal. from T2 back to T1.
qp =?TT12Cp (Prod . +Cal .)dT =?HII
??H ()=?T2C (Prod . +Cal . dT ?? T2C caldT =? cal
rx T1The objective is to measure
isothermal
?Hrx T1 Reactants (T1) = Products (T1)
()
constant p
• Constant pressure (for solutions)
CALORIMETER
reaction thermometer Adiabatic Constant p
adiabatic
I) ?HI React. (T1) + Cal. (T1) = Prod. (T2) + Cal. (T2)
constant p
II) ?HII Prod. (T2) + Cal. (T2) = Prod. (T1) + Cal. (T1)
constant p
?Hrx (T1 ) React. (T1) + Cal. (T1) = Prod. (T1) + Cal. (T1)
constant p
?Hrx (T1 )=?HI +?HII
(I)
Purpose is to measure (T2 -T1)
Adiabatic, const. p ? qp =0 ??HI =0
(II)
Purpose is to measure heat qp needed to take prod. + cal. from T2 back to T1.
qp =?TT12Cp (Prod . +Cal .)dT =?HII
??H ()=?T2C (Prod . +Cal . dT ?? T2C caldT =? cal
rx T1